Lusting for iPad 2? Get top dollar for your iPad 1 | ZDNet
Their prices are actually very fair. I have a 16gb WiFi that I rate in perfect condition, with original adapter and cables. They quote me $300 for it, and they pay for shipping.
Given that refurbs are going for $349 at the Apple Store, that price is very good compared to the hassle of trying to sell it on eBay.